Add VideoFrame class.

This puts a frame index with an Eyes, which simplifies code in
some areas.  I can't think of a better name for it,
unfortunately.

1 files changed, 48 insertions, 0 deletions

diff --git a/src/lib/video_frame.cc b/src/lib/video_frame.cc
new file mode 100644
index 000000000..e2223ff9e
--- /dev/null
+++ b/src/lib/video_frame.cc
@@ -0,0 +1,48 @@
+/*
+    Copyright (C) 2016 Carl Hetherington <cth@carlh.net>
+
+    This file is part of DCP-o-matic.
+
+    DCP-o-matic is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    DCP-o-matic is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+#include "video_frame.h"
+
+VideoFrame &
+VideoFrame::operator++ ()
+{
+	if (_eyes == EYES_BOTH) {
+		++_index;
+	} else if (_eyes == EYES_LEFT) {
+		_eyes = EYES_RIGHT;
+	} else {
+		_eyes = EYES_LEFT;
+		++_index;
+	}
+
+	return *this;
+}
+
+bool
+operator== (VideoFrame const & a, VideoFrame const & b)
+{
+	return a.index() == b.index() && a.eyes() == b.eyes();
+}
+
+bool
+operator!= (VideoFrame const & a, VideoFrame const & b)
+{
+	return !(a == b);
+}